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RETIREMENT PLANS (Tables) | 12 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] |
| Defined Benefit Pension Plans
| 2024 |  | 2023 |  | 2022
| U.S. Pension Plans |  | Non-U.S. Pension Plans |  | U.S. Pension Plans |  | Non-U.S. Pension Plans |  | U.S. Pension Plans |  | Non-U.S. Pension Plans
Service cost | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 3 |
Interest cost | 1 |  |  | 8 |  |  | 1 |  |  | 7 |  |  | 4 |  |  | 4 |
Expected return on plan assets | (1) |  |  | (7) |  |  | — |  |  | (7) |  |  | (6) |  |  | (7) |
Amortization of net loss | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | 1 |
Settlement (gain) loss (1) | — |  |  | — |  |  | (9) |  |  | — |  |  | 22 |  |  | — |
Net periodic pension benefit cost (income) | $ | — |  |  | $ | 3 |  |  | $ | (8) |  |  | $ | 3 |  |  | $ | 20 |  |  | $ | 1 |
(1) Effective June 30, 2021, the Company terminated the Esterline Retirement Plan (the “ERP”) in accordance with regulatory requirements. P ension obligations were distributed through a combinat ion of lump sum payments (using existing plan assets) to eligible plan participants and the purchase of a group annuity contract in fiscal 2022. During the third quarter of fiscal 2022, the Company transferred the remaining benefit obligations to an insurance company to purchase a group annuity contract. In connection with the transfer, a settlement loss of approximately $22 million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2022. Upon the finalization of the group annuity purchase funding during fiscal 2023, a settlement (gain) of approximately $(9) million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2023. No settlement (gain) or loss was recorded in fiscal 2024.
Schedule of Net Funded Status [Table Text Block] | The changes in benefit obligations and plan assets, funded status and amounts recognized in the consolidated balance sheets and accumulated other comprehensive loss for pension plans at September 30, 2024 and 2023, were as follows (in millions):
| Defined Benefit Pension Plans |
| September 30, 2024 |  | September 30, 2023 |
| U.S. Pension Plans |  | Non-U.S. Pension Plans |  | U.S. Pension Plans |  | Non-U.S. Pension Plans |
Benefit Obligations |  |  |  |  |  |  |  |
Beginning balance | $ | 12 |  |  | $ | 144 |  |  | $ | 15 |  |  | $ | 148 |  |
Currency translation adjustment | — |  |  | 5 |  |  | — |  |  | 8 |  |
Service cost | — |  |  | 2 |  |  | — |  |  | 2 |  |
Interest cost | 1 |  |  | 8 |  |  | 1 |  |  | 7 |  |
Actuarial loss (gain) | — |  |  | 15 |  |  | (1) |  |  | (13) |  |
Plan amendments | — |  |  | 3 |  |  | — |  |  | — |  |
Benefits paid | (1) |  |  | (9) |  |  | (3) |  |  | (8) |  |
Ending balance | $ | 12 |  |  | $ | 168 |  |  | $ | 12 |  |  | $ | 144 |  |
Plan Assets - Fair Value |  |  |  |  |  |  |  |
Beginning balance | $ | 8 |  |  | $ | 139 |  |  | $ | 9 |  |  | $ | 133 |  |
Currency translation adjustment | — |  |  | 5 |  |  | — |  |  | 6 |  |
Realized and unrealized gain on plan assets | 1 |  |  | 25 |  |  | 11 |  |  | 6 |  |
Company contributions (refunds) | 1 |  |  | 5 |  |  | (9) |  |  | 2 |  |
Benefits paid | (1) |  |  | (9) |  |  | (3) |  |  | (8) |  |
Ending balance | $ | 9 |  |  | $ | 165 |  |  | $ | 8 |  |  | $ | 139 |  |
Funded Status |  |  |  |  |  |  |  |
Fair value of plan assets | $ | 9 |  |  | $ | 165 |  |  | $ | 8 |  |  | $ | 139 |  |
Benefit obligations | (12) |  |  | (168) |  |  | (12) |  |  | (144) |  |
Net amount recognized | $ | (3) |  |  | $ | (3) |  |  | $ | (4) |  |  | $ | (5) |  |
Amount Recognized on Consolidated Balance Sheets |  |  |  |  |  |  |  |
Other non-current assets | $ | — |  |  | $ | 13 |  |  | $ | — |  |  | $ | 12 |  |
Accrued and other current liabilities | — |  |  | — |  |  | (1) |  |  | — |  |
Other non-current liabilities | (3) |  |  | (16) |  |  | (3) |  |  | (17) |  |
Net amount recognized | $ | (3) |  |  | $ | (3) |  |  | $ | (4) |  |  | $ | (5) |  |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) |  |  |  |  |  |  |  |
Net loss (gain) | $ | 1 |  |  | $ | (1) |  |  | $ | 1 |  |  | $ | 1 |  |
Prior service cost | — |  |  | 4 |  |  | — |  |  | 1 |  |
Ending balance | $ | 1 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | 2 |  |
Schedule of Expected Benefit Payments [Table Text Block] | Estimated future benefit payments expected to be paid from the pension and post-retirement pension plans or from the Company’s assets are as follows (in millions):
Fiscal Years Ended September 30, |  |
2025 |  | $ | 12 |
2026 |  | 12 |
2027 |  | 12 |
2028 |  | 13 |
2029 |  | 13 |
2030 - 2034 |  | 66 |
Defined Benefit Plan, Assumptions [Table Text Block] |
| U.S. Defined Benefit Pension Plans |  | Non-U.S. Defined Benefit Pension Plans
Principal assumptions as of year end | 2024 |  | 2023 |  | 2024 |  | 2023
Discount rate | 5.20% |  | 5.25% |  | 4.74% |  | 5.56%
Rate of increase in future compensation levels | N/A (1) |  | N/A (1) |  | 3.24% |  | 3.19%
Assumed long-term rate of return on plan assets | 6.00% |  | 5.37% |  | 5.42% |  | 5.41%
(1)As a result of the plan freeze to the ERP during fiscal 2021, for all future benefit accruals and participation by new or rehired employees on or after January 1, 2021, the assumed rate of increase in future compensation levels was not applicable as of September 30, 2024 and 2023, as pay increases are not valued once a defined benefit pension plan is frozen. The ERP settlement occurred in fiscal 2022.
Defined Benefit Plan, Plan Assets, Allocation [Table Text Block] | Allocations by investment type are as follows:
|  |  |  | Actual
Plan assets allocation as of fiscal year end |  | Target |  | 2024 |  | 2023
Return-seeking assets (e.g., equity securities and real estate) |  | 35% - 55% |  | 46.0% |  | 42.7%
Fixed-income securities (e.g., debt securities) |  | 45% - 65% |  | 53.8% |  | 56.0%
Cash |  | 0% |  | 0.2% |  | 1.3%
Total |  |  |  | 100.0% |  | 100.0%
Defined Benefit Plan, Plan Assets, Category [Table Text Block] | The following table presents the fair value of the Company’s pension plan assets as of September 30, 2024 and 2023, segregated by level within the fair value hierarchy as described in Note 18, “Fair Value Measurements” (in millions):
|  | Fair Value Hierarchy
|  | September 30, 2024 |  | September 30, 2023
Investments measured at fair value by level: (4) |  |  |  |
Level 1 (1) |  | $ | 39 |  |  | $ | 29 |
Level 2 (2) |  | 47 |  |  | 40
Investments measured at net asset value (3) |  | 88 |  |  | 78
Total |  | $ | 174 |  |  | $ | 147 |
(1) Level 1 investments include return seeking assets, which are primarily equity securities and real estate, are actively traded on U.S. and non-U.S. exchanges and valued using the market approach at quoted market prices on the measurement date or at the net asset value of the shares held by the plan on the measurement date based on quoted market prices. Includes cash and cash equivalents which is used to pay benefits and cash invested in a short-term investment fund that holds securities with values based on quoted market prices, but for which the funds are not valued on quoted market basis. (2) Level 2 investments include fixed-income securities, which are primarily debt securities, are primarily valued using the market approach at either quoted market prices, pricing models that use observable market data, or bids provided by independent investment brokerage firms. (3) These investments are valued at the net asset value (“NAV”) of units held. The NAV is used to estimate fair value and is based on the fair value of the underlying investments held by the fund less its liability. (4) No investments measured using Level 3 inputs.

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